Do Flashers Kill Battery?

Do those annoying flashers on your car kill battery? It seems like a silly question, but it is one that many drivers wonder about. If you are looking for the answer to this and other questions like "Does the clicking sound at stoplights hurt my engine?" then we have some good news for you: we've got answers! Check out our blog post for all of the information you need to know about how your vehicle works.

How long can hazard lights stay on before battery dies?

A variety can drain a car's battery of electrical gadgets, but the most common culprit is a hazard-light system.

Hazard lights are important for safety, but leaving them on for too long can drain the battery.

Many drivers know that hazard lights should not be used when parking in a garage or dark area to avoid confusing other motorists with their signals. However, it is easy to forget this rule of thumb and leave your hazards on while driving through an isolated desert road or a snowstorm.

Even though it's tempting to use your hazard lights when you feel stranded, the battery will die in a few hours (about 4 to 5 hours) if they are kept on.

Should I leave my hazards on?

Leaving hazards on is a personal choice and depends on the kind of hazard lights you have. If your flashers are turnable, then there is no need to worry about battery life as they will only work when turned back on. On some older model cars (the early 2000s), hazards automatically shut off after turning them on for 20 minutes or so; if this is the case, it is best to shut them off after you are done using them.

If your hazard lights will not turn on unless they are connected to a battery pack or some other power source, then shutting them off as soon as possible is advised since battery life can be significantly reduced if left on for an extended period of time (i.e., several hours).

Leaving hazards on for too long will reduce the life of your car's battery. The length of time that a flasher is left in the "on" position depends on what type it is and how much power they draw while activated.

When hazard lights are used, the power they draw is pulled from your vehicle's main electrical system, which includes your engine and all of its components.

Often people don't realize that leaving hazards on can dramatically lower their car's battery life and reduce the life of the vehicle. Some hazard lights will drain a car's battery in just minutes, while others can last hours.

Do hazards stay on when car off?

If the hazards are left on after the car is turned off, this might drain your battery.

It's best to turn them off when you're not in your vehicle with the engine running. Think of it as a safety feature for fellow motorists. An extended flash can blind other drivers or pedestrians in your vicinity.

It's not just about draining your battery. Leaving hazards on for too long might also leave you stranded if the car completely dies out. When the battery on your car is dead, it will no longer provide enough current for the hazard lights to work. The switch can be used as a reminder that you need another set of headlights or taillights when driving during dimming hours.

How long can emergency lights be on?

This is a common question, but there are different answers depending on the type of flasher.

Some sources say that you can leave your hazards lights on for at least 15 minutes before draining the battery for older cars without electronic or digital gauges. However, modern cars have computers in them, and most will shut off when they get too hot. If you leave your hazards on too long, the computer in the car could burn out and cost hundreds of dollars to replace.

Car batteries are not made to last forever. Eventually, they will lose their ability to hold a charge and need replacing after about four years or so (although this does vary with usage). A battery that is dying can be helped by not draining it with the flashers but will likely need to be replaced.

If your battery is dying or you want to make sure that you don't accidentally drain it when using emergency lights, start conserving energy in other ways too. Don't leave interior lights on overnight and turn off everything unnecessary when driving (radio/heater/etc.).


It's important to remember that hazards are intended for use in an emergency situation. If you decide to leave them on, there are a few things that may happen.

First of all, your battery might be completely drained by the time you return to your car. Additionally, leaving hazards on for too long could cause damage to the vehicle itself. If they're left running for an extended period of time in extreme heat or cold, the temperature could affect your car's components, including the air conditioner and defroster.

One last thing to consider is that using hazards in an emergency situation reduces your visibility. It may cause an accident or at least be distracting to other drivers.

We hope this information helps you decide whether or not leaving your hazards turned on is something worth considering next time you're out driving around town.

About the author, Phil Borges

Phil Borges is a battery aficionado. He's written extensively about batteries, and he loves nothing more than discussing the latest innovations in the industry. He has a deep understanding of how batteries work, and he's always on the lookout for new ways to improve their performance.